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The U.S. Department of Homeland Security (DHS) released its public findings from Operation Cyber Storm, a large-scale tabletop simulation of a coordinated cyber attack on the government and critical infrastructure that was held in February, 2006.
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The exercise simulated a large-scale cyber campaign that disrupts multiple critical infrastructure, as well as simulated "physical demonstrations and distrubances" to test the ability of government to respond to multiple incidents simultaneously, even when its not clear that the events are related (read: 9/11).
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Or how about this one:
"Contingency planning for backup or resilient communications methods is a critical need. While only tested for a few players during the exercise, many players noted a high reliance of cyber incident response activities on communication systems that can be,
themselves, vulnerable to attack or failure."
So if Cyber Storm was designed to assess the U.S. government's readiness to respond to a coordinated physical and cyber attack on critical infrastructure, the conclusion of this report may be that such an attack, if launched, may well succeed. From the report:
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http://weblog.infoworld.com/techwatch/archives/007886.html